Stop in for a cup of coffee

I used that one until atempting to install the TTI shorty headers.
It was made by K-H and not exclusive to MP.

from the instructions but this chart can be found in a number of places. IIRC its in Fred Puhn's Brake Handbook.
View attachment 1715871377


Green line represents factory pressures
from here 1967 Chrysler Imperial Disc Brake System From the Master Technicians Service Conference Session 233
I put a prop valve from a Newport, like a 69, and it works perfect in my Dart....Now, Took a while to get brakes solid....